android 3.0 for button listener said not applicable for the argument

[Sara Brown]

i am new to android 3.0 and i am having trouble with android 3.0 to make button listener.

this is my code

btn1 = (Button) findViewById(R.id.button1);
    btn1.setOnClickListener(this);

}

public void onClick(View v){
    Toast.makeText(this, "its working", 2500).show();
}

i even tried this

btn1 = (Button) findViewById(R.id.button1);
    btn1.setOnClickListener(new OnClickListener(){
        public void onClick(View v){
            Toast.makeText(Relative2Activity.this, "its working", 2500).show(); 
        }
    });

however, it said [quote] the method setOnClickListener(View.OnClickListener) in the type View is not applicable for the argument   [/quote]

please, help me with this. 

[swarna byrappa]

public class check extends Activity implements android.view.View.OnClickListener{

}

try implementing android.view.View.OnClickListener rather than OnClickListener.